The teres minor muscle lies deep to the teres major muscle on the posterior thoracic wall but dorsal to the scapula. The main action of this muscle is to laterally rotate the arm (i.e., turn the hand and thumb clockwise).
The proximal attachment (origin) is the superior lateral scapula and the distal attachment (insertion) is the greater tubercle of the humerus. The posterior branch of the axillary nerve provides innervation to the muscle.
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